AttributeError: 'DistUpgradeController' object has no attribute 'tasks'
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
ubuntu-release-upgrader (Ubuntu) |
New
|
Undecided
|
Unassigned |
Bug Description
While upgrading Kubuntu 18.04 to 20.04.1, the upgrader tool crashed with the stack trace below.
I then ran apt update && apt full-upgrade manually from terminal, restarted into a broken login screen, found out plasma is not installed, and manually installed all packages in the distribution manifest to fix the system. It all started with this:
Traceback (most recent call last):
File "/tmp/ubuntu-
sys.
File "/tmp/ubuntu-
if app.run():
File "/tmp/ubuntu-
return self.fullUpgrade()
File "/tmp/ubuntu-
if not self.calcDistUp
File "/tmp/ubuntu-
if not self.cache.
AttributeError: 'DistUpgradeCon
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/
self.write(f)
File "/usr/lib/
block = f.read(1048576)
File "/usr/lib/
(result, consumed) = self._buffer_
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte
Original exception was:
Traceback (most recent call last):
File "/tmp/ubuntu-
sys.
File "/tmp/ubuntu-
if app.run():
File "/tmp/ubuntu-
return self.fullUpgrade()
File "/tmp/ubuntu-
if not self.calcDistUp
File "/tmp/ubuntu-
if not self.cache.
AttributeError: 'DistUpgradeCon